Yield, chemical composition, and efficiency of use of nitrogen by Marandu grass

Abstract

-The objective of this study was to evaluate the effect of five nitrogen doses on the productive and quality characteristics and the use efficiency of Brachiaria brizantha cv. Marandu grass. The treatments consisted of four doses of nitrogen (0, 60, 120, 180 and 240 kg ha -1 ), distributed through a completely randomized design with four replicates. Samples of the material were collected to analyze productivity variables, concentrations of neutral detergent fiber, crude protein and neutral detergent insoluble nitrogen, and in vitro dry matter digestibility. The nitrogen use efficiency, recovery of the applied nitrogen (RAN) and agronomic efficiency of the applied nitrogen (AE) were calculated. Dry mass production increased by 1,624.67 (kg/ha) as the nitrogen doses were increased. The doses of nitrogen affected the concentrations of neutral detergent fiber (from 294.6 to 381.4 g.kg −1 , in the leaf), crude protein (from 86.1 to 99.6 g.kg −1 , in the leaf) and neutral detergent insoluble protein (from 402.9 to 396.2 g.kg −1 CP, in the leaf). Nitrogen use efficiency increased, whereas RAN and AE were not affected by the nitrogen doses. Nitrogen fertilization promotes improvement in productivity and chemical composition of Marandu grass, also improving the efficiency with which the grass utilizes the nitrogen.

Yield, chemical composition, and efficiency of utilization of applied nitrogen from BRS Kurumi pastures

“…Although, lower than the other treatments tested, the average biomass production observed for the 0 kgn/ha/ano dose can be considered high (15,626 kg DM/ha/year) even more because it did not has received nitrogen fertilization and was planted in a soil with low OM content (16.74 g/kg). This result might be explained by the ability of some cultivars of elephant grass to perform biological fixation of atmospheric nitrogen (BnF) (OLIVEIRA et al 2014). According to MORAIS et al (2012), the BnF dependence of elephant grass might vary depending on the type of soil and genotype and can reach up to 50% of the n requirements of this grass.…”

“…applied) of elephant grass cultivars in comparison to other forage grass species (OLIVEIRA et al 2014).…”

EFICIENCIA AGRONÓMICA DE NITRÓGENO Y PRODUCCIÓN DE Cynodon plectostachyus (K. Schum.) Pilg. EN FUNCIÓN DE DOS FRECUENCIAS DE CORTE

“…La eficiencia agronómica de N obtenidas se contraponen a los resultados reportados por Silveira et al (2007) y Schneider et al (2019 quienes reportaron que la eficiencia de la fertilización nitrogenada tiende a disminuir a medida que se incrementan las tasas de N. Sin embargo, los resultados se asemejan a los reportados por Sigua et al (2013), quienes reportaron mayor eficiencia agronómica en Panicum hematomon y Paspalum notatum cuando las dosis de N se incrementó de 100 a 200 kg ha -1 en suelos inundados. Resultados similares fueron hallados por Oliveira et al (2014) que alcanzaron mayor eficiencia agronómica con dosis crecientes de 0, 60, 120, 180, 240 kg N ha -1 en pasto Brachiaria brizantha cv. Marandu.…”

Diagnose do estado nutricional de nitrogênio, potássio e cálcio em >i<Urochloa brizantha>/i< cv. Marandu utilizando-se técnicas de >i<machine learning>/i<

“…O princípio das pesquisas com plantas forrageiras e pastagens, em países com sistemas de criação de animais, data do início dos anos 1900 (DA SILVA; SBRISSIA; PEREIRA, 2015) desde então, muitos trabalhos demonstrando a importância do suprimento mineral com nitrogênio são constantemente realizados (ABREU; BÉLANGER;GASTAL, 2000;COSTA et al, 2019COSTA et al, , 2009LEMAIRE, 2002;LORETO et al, 2019;OLIVEIRA et al, 2014;SILVA et al, 2013) ainda assim, por ser o nutriente cuja função é estimular o crescimento vegetativo das plantas, as principais pesquisas envolvendo este elemento em forrageiras dizem respeito a aspectos morfológicos e fisiológicos (ALVES et al, 2019;BRAMBILLA et al, 2012;DUPAS et al, 2016;PAIVA et al, 2015;PEREIRA et al, 2015).…”